Display screen or portion thereof with computer-generated graphical bouncing screen transition



FIG. 1 is a front view of a display screen or portion thereof with a computer-generated graphical bouncing screen transition showing a first image; and,

FIGS. 2-33 are showing the second through thirty-third images thereof.

The appearance of the computer-generated graphical bouncing screen sequentially transitions between the images shown in FIGS. 1-33. The process or period in which one image transitions to another forms no part of the claimed design.

The broken lines and texts shown on the display screen or portion thereof are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with computer-generated graphical bouncing screen transition, as shown and described. 